| 摘要 |
<p>57 A Composite Shift Keying (CSK) modulation technique is described which provides enhanced error detection capability in a noisy transmission medium, such as an AC power line. A modulation binary signal causes the generation of two or three possible transmitted signals, and when the modulating binary signal is idle, no signal is transmitted. When the modulating signal is active, a single frequency qualifying signal (of radian frequency Wqt) is transmitted. If the active binary signal is a logical (0), an additional single frequency (of radian frequency WO) is transmitted along with Wqt. If the active binary signal is a logical (1), a different single frequency (of radian freqency W1) is transmitted with Wqt.</p> |
